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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db42abb0d53fcf7b74aff53ad14926d5b0505dcc5361c16614d2d3b1f476d91c' 
  AND token = 'kHUpZe1uZNJW2ZRxWG56qsZPQduzJlXHQURFKjuCOZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}